What was found
FLT#498, SEA-BOS. ' LEVEL 2 FUME EVENT NOTICED BY MULTIPLE CREW MEMBERS IN THE CABIN. DESCRIBED AS SWEET MAGIC MARKER SMELL ELIMINATING FROM A/C VENTS. COMPLIED W/ ODOR ISOL PROCEDURE. EVENT CAUSED EYE IRRITATION; C/W INFORMATION NOTICE 2017-T015, SECTION B2. IDENTIFIED ODOR TO BE OF TYPE 1, REF. DEFECT # 4257972, ITEM 1 (REMOVED AND REPLACED APU IAW AMM 49-11-11.OPS CHECK & LEAK CHECK STILL REQUIRED PER W/O #1396242 TC A320-49-11-11-400-004) FOR CORRECTIVE ACTION (APU CHANGE) PERFORMED DECONTAMINATION LEVEL 3. NO DEFECTS NOTED, OPS CHK OK, A/C OK TO CONTINUE.'